One of my cresties never seems to be anywhere but the bottom of her tub. She's setup in a tub by herself. There are wooden dowels and fake plants throughout, but I have never seen her any place but hiding under one of the fake plants on the bottom. I'm a night owl and will randomly check on them during the night (I know they are active at night), but she's still at the bottom of the tub.

Is this something I should worry about? She eats well and seems healthy.